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Equipment needed:

crucible + lidpipe-clay triangle

bunsen burnertongs

heatproof matelectronic balance

sandpaper

Pre-lab exercise:

Collect a 5 cm length of magnesium ribbon and use steel wool or sandpaper to expose the pure magnesium by removing the oxidized magnesium.

A) Using the digital balance determine the mass of the magnesium. ______

B) Rewrite the balanced chemical equation for this reaction.

C) Similar to the sequence you have just been shown determine the number of moles that are available to react. Perform this calculation as a proportion.

1 mole Magnesium =    ?      g

D) Using the initial mass of your magnesium ribbon you are using and the sequence used earlier determine the theoretical yield for your magnesium ribbon burning. Remember you must compare the number of moles of the reactant (magnesium) with the product (magnesium oxidized) based on the balanced chemical equation.

Experimental Procedure:

1.

Determine the mass of the crucible and lid. Record result in chart below.

2.

Roll the magnesium ribbon into a loose coil and place in the crucible.

3.

Reweigh the crucible, lid and magnesium. Record results.

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